Well versed with debugging tools, can quickly walk through the code using a debugger in all technologies, should be able to ramp up quickly with just traversing the code base.
Good hands on command line tools, Linux / Bash scripts / CI / CD pipelines and understanding DevOps principles, understand automation scripts for code build and deployment.
Should be able to integrate 3rd party libraries, be able to locate and understand documentation and APIs quickly and adapt to the community guidelines provided by all platforms.